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Gearing up to boot ISIS from Iraq's 2nd largest city

In northern Iraq, the United States is helping local troops gear up for a new offensive against ISIS in Mosul. It's thought that ISIS has several thousand fighters in Mosul, but now they're stopping civilians from leaving the city, which means, effectively, that ISIS has over a million human shields. Holly Williams, who got caught up in the middle of the chaos with her crew, reports.
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